What does IRIG stand for?
Inter Range Instrumentation Group
What is IRIG Standard?
Modern day electronic systems such as communication systems, data handling
systems, and missile and spacecraft tracking systems require time-of-day and
year information for correlation of data with time. Serial formatted time codes
are used to efficiently interface the timing system output with the user system.
Standardization of time codes is necessary to ensure system compatibility among
the various ranges, ground tracking networks, spacecraft and missile projects,
data reduction facilities, and international cooperative projects.
These digital codes are typically amplitude
modulated on an audio sine wave carrier or transmitted as fast rise-time TTL
The use of the IRIG standard is to provide a standard protocol for serial time
codes that are generated for correlation of data with time.
What is the latest IRIG specification?
IRIG Standard 200-04 (added year information to format). Previous
revisions are IRIG Standard 200-98 (added
Manchester modulation) and IRIG Standard 200-95. IRIG Document
104-60 was the original standard accepted in 1960.
What is IRIG-B?
IRIG-B refers to a serial time code format. This a timing signal
that has a rate of 100 pulse per second signal, There are other rate that
are designated in accordance with the IRIG Standard 200-04 (see below).
IRIG-B sends Day of Year, Hour, Minute and
Second data on a 1KHz carrier, with an update rate of one second. IRIG-B
DCLS (DC level shift) is IRIG-B without the 1KHz Carrier.
What are the IRIG Formats?
|| Count Interval
|| 1,000 PPS (pulse per second)
|| 1 ms
|| 100 PPS
|| 10 ms
|| 1 PPM (pulse per minute)
|| 1 minute
|| 10 PPS
|| 0.1 second
|| 10,000 PPS
|| 0.1 ms
|| 1 PPS
|| 1 second
Note IRIG-C was replaced by IRIG-H
More detail on IRIG Designations (e.g. IRIG-B120)
How to Interfacing with high voltage IRIG
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